Reverse engineering a dictionary (whether in the form of a software program or a scanned PDF of a book) is not always legal, although a case can be made for being allowed to hack certain things under certain circumstances. In any case, if the knowledge is already out there (e.g. online) I see no reason not to point you in the right direction. A lot can be learned from these dark arts.
External links
General
Van Dale
- https://www.proz.com/forum/dutch/300526-patch_voor_van_dale_elektronische_woordenboeken.html
- https://www.proz.com/forum/apple_mac_operating_systems/315778-van_dale_app_on_the_mac.html